security/dummy.c

   1 /*
   2  * Stub functions for the default security function pointers in case no
   3  * security model is loaded.
   4  *
   5  * Copyright (C) 2001 WireX Communications, Inc <chris@wirex.com>
   6  * Copyright (C) 2001-2002  Greg Kroah-Hartman <greg@kroah.com>
   7  * Copyright (C) 2001 Networks Associates Technology, Inc <ssmalley@nai.com>
   8  *
   9  *      This program is free software; you can redistribute it and/or modify
  10  *      it under the terms of the GNU General Public License as published by
  11  *      the Free Software Foundation; either version 2 of the License, or
  12  *      (at your option) any later version.
  13  */
  14
  15 #undef DEBUG
  16
  17 #include <linux/capability.h>
  18 #include <linux/kernel.h>
  19 #include <linux/mman.h>
  20 #include <linux/pagemap.h>
  21 #include <linux/swap.h>
  22 #include <linux/security.h>
  23 #include <linux/skbuff.h>
  24 #include <linux/netlink.h>
  25 #include <net/sock.h>
  26 #include <linux/xattr.h>
  27 #include <linux/hugetlb.h>
  28 #include <linux/ptrace.h>
  29 #include <linux/file.h>
  30
  31 static int dummy_ptrace (struct task_struct *parent, struct task_struct *child)
  32 {
  33         return 0;
  34 }
  35
  36 static int dummy_capget (struct task_struct *target, kernel_cap_t * effective,
  37                          kernel_cap_t * inheritable, kernel_cap_t * permitted)
  38 {
  39         *effective = *inheritable = *permitted = 0;
  40         if (target->euid == 0) {
  41                 *permitted |= (~0 & ~CAP_FS_MASK);
  42                 *effective |= (~0 & ~CAP_TO_MASK(CAP_SETPCAP) & ~CAP_FS_MASK);
  43         }
  44         if (target->fsuid == 0) {
  45                 *permitted |= CAP_FS_MASK;
  46                 *effective |= CAP_FS_MASK;
  47         }
  48         return 0;
  49 }
  50
  51 static int dummy_capset_check (struct task_struct *target,
  52                                kernel_cap_t * effective,
  53                                kernel_cap_t * inheritable,
  54                                kernel_cap_t * permitted)
  55 {
  56         return -EPERM;
  57 }
  58
  59 static void dummy_capset_set (struct task_struct *target,
  60                               kernel_cap_t * effective,
  61                               kernel_cap_t * inheritable,
  62                               kernel_cap_t * permitted)
  63 {
  64         return;
  65 }
  66
  67 static int dummy_acct (struct file *file)
  68 {
  69         return 0;
  70 }
  71
  72 static int dummy_capable (struct task_struct *tsk, int cap)
  73 {
  74         if (cap_raised (tsk->cap_effective, cap))
  75                 return 0;
  76         return -EPERM;
  77 }
  78
  79 static int dummy_sysctl (ctl_table * table, int op)
  80 {
  81         return 0;
  82 }
  83
  84 static int dummy_quotactl (int cmds, int type, int id, struct super_block *sb)
  85 {
  86         return 0;
  87 }
  88
  89 static int dummy_quota_on (struct dentry *dentry)
  90 {
  91         return 0;
  92 }
  93
  94 static int dummy_syslog (int type)
  95 {
  96         if ((type != 3 && type != 10) && current->euid)
  97                 return -EPERM;
  98         return 0;
  99 }
 100
 101 static int dummy_settime(struct timespec *ts, struct timezone *tz)
 102 {
 103         if (!capable(CAP_SYS_TIME))
 104                 return -EPERM;
 105         return 0;
 106 }
 107
 108 static int dummy_vm_enough_memory(struct mm_struct *mm, long pages)
 109 {
 110         int cap_sys_admin = 0;
 111
 112         if (dummy_capable(current, CAP_SYS_ADMIN) == 0)
 113                 cap_sys_admin = 1;
 114         return __vm_enough_memory(mm, pages, cap_sys_admin);
 115 }
 116
 117 static int dummy_bprm_alloc_security (struct linux_binprm *bprm)
 118 {
 119         return 0;
 120 }
 121
 122 static void dummy_bprm_free_security (struct linux_binprm *bprm)
 123 {
 124         return;
 125 }
 126
 127 static void dummy_bprm_apply_creds (struct linux_binprm *bprm, int unsafe)
 128 {
 129         if (bprm->e_uid != current->uid || bprm->e_gid != current->gid) {
 130                 set_dumpable(current->mm, suid_dumpable);
 131
 132                 if ((unsafe & ~LSM_UNSAFE_PTRACE_CAP) && !capable(CAP_SETUID)) {
 133                         bprm->e_uid = current->uid;
 134                         bprm->e_gid = current->gid;
 135                 }
 136         }
 137
 138         current->suid = current->euid = current->fsuid = bprm->e_uid;
 139         current->sgid = current->egid = current->fsgid = bprm->e_gid;
 140
 141         dummy_capget(current, &current->cap_effective, &current->cap_inheritable, &current->cap_permitted);
 142 }
 143
 144 static void dummy_bprm_post_apply_creds (struct linux_binprm *bprm)
 145 {
 146         return;
 147 }
 148
 149 static int dummy_bprm_set_security (struct linux_binprm *bprm)
 150 {
 151         return 0;
 152 }
 153
 154 static int dummy_bprm_check_security (struct linux_binprm *bprm)
 155 {
 156         return 0;
 157 }
 158
 159 static int dummy_bprm_secureexec (struct linux_binprm *bprm)
 160 {
 161         /* The new userland will simply use the value provided
 162            in the AT_SECURE field to decide whether secure mode
 163            is required.  Hence, this logic is required to preserve
 164            the legacy decision algorithm used by the old userland. */
 165         return (current->euid != current->uid ||
 166                 current->egid != current->gid);
 167 }
 168
 169 static int dummy_sb_alloc_security (struct super_block *sb)
 170 {
 171         return 0;
 172 }
 173
 174 static void dummy_sb_free_security (struct super_block *sb)
 175 {
 176         return;
 177 }
 178
 179 static int dummy_sb_copy_data (struct file_system_type *type,
 180                                void *orig, void *copy)
 181 {
 182         return 0;
 183 }
 184
 185 static int dummy_sb_kern_mount (struct super_block *sb, void *data)
 186 {
 187         return 0;
 188 }
 189
 190 static int dummy_sb_statfs (struct dentry *dentry)
 191 {
 192         return 0;
 193 }
 194
 195 static int dummy_sb_mount (char *dev_name, struct nameidata *nd, char *type,
 196                            unsigned long flags, void *data)
 197 {
 198         return 0;
 199 }
 200
 201 static int dummy_sb_check_sb (struct vfsmount *mnt, struct nameidata *nd)
 202 {
 203         return 0;
 204 }
 205
 206 static int dummy_sb_umount (struct vfsmount *mnt, int flags)
 207 {
 208         return 0;
 209 }
 210
 211 static void dummy_sb_umount_close (struct vfsmount *mnt)
 212 {
 213         return;
 214 }
 215
 216 static void dummy_sb_umount_busy (struct vfsmount *mnt)
 217 {
 218         return;
 219 }
 220
 221 static void dummy_sb_post_remount (struct vfsmount *mnt, unsigned long flags,
 222                                    void *data)
 223 {
 224         return;
 225 }
 226
 227
 228 static void dummy_sb_post_addmount (struct vfsmount *mnt, struct nameidata *nd)
 229 {
 230         return;
 231 }
 232
 233 static int dummy_sb_pivotroot (struct nameidata *old_nd, struct nameidata *new_nd)
 234 {
 235         return 0;
 236 }
 237
 238 static void dummy_sb_post_pivotroot (struct nameidata *old_nd, struct nameidata *new_nd)
 239 {
 240         return;
 241 }
 242
 243 static int dummy_sb_get_mnt_opts(const struct super_block *sb, char ***mount_options,
 244                                  int **flags, int *num_opts)
 245 {
 246         *mount_options = NULL;
 247         *flags = NULL;
 248         *num_opts = 0;
 249         return 0;
 250 }
 251
 252 static int dummy_sb_set_mnt_opts(struct super_block *sb, char **mount_options,
 253                                  int *flags, int num_opts)
 254 {
 255         if (unlikely(num_opts))
 256                 return -EOPNOTSUPP;
 257         return 0;
 258 }
 259
 260 static void dummy_sb_clone_mnt_opts(const struct super_block *oldsb,
 261                                     struct super_block *newsb)
 262 {
 263         return;
 264 }
 265
 266 static int dummy_inode_alloc_security (struct inode *inode)
 267 {
 268         return 0;
 269 }
 270
 271 static void dummy_inode_free_security (struct inode *inode)
 272 {
 273         return;
 274 }
 275
 276 static int dummy_inode_init_security (struct inode *inode, struct inode *dir,
 277                                       char **name, void **value, size_t *len)
 278 {
 279         return -EOPNOTSUPP;
 280 }
 281
 282 static int dummy_inode_create (struct inode *inode, struct dentry *dentry,
 283                                int mask)
 284 {
 285         return 0;
 286 }
 287
 288 static int dummy_inode_link (struct dentry *old_dentry, struct inode *inode,
 289                              struct dentry *new_dentry)
 290 {
 291         return 0;
 292 }
 293
 294 static int dummy_inode_unlink (struct inode *inode, struct dentry *dentry)
 295 {
 296         return 0;
 297 }
 298
 299 static int dummy_inode_symlink (struct inode *inode, struct dentry *dentry,
 300                                 const char *name)
 301 {
 302         return 0;
 303 }
 304
 305 static int dummy_inode_mkdir (struct inode *inode, struct dentry *dentry,
 306                               int mask)
 307 {
 308         return 0;
 309 }
 310
 311 static int dummy_inode_rmdir (struct inode *inode, struct dentry *dentry)
 312 {
 313         return 0;
 314 }
 315
 316 static int dummy_inode_mknod (struct inode *inode, struct dentry *dentry,
 317                               int mode, dev_t dev)
 318 {
 319         return 0;
 320 }
 321
 322 static int dummy_inode_rename (struct inode *old_inode,
 323                                struct dentry *old_dentry,
 324                                struct inode *new_inode,
 325                                struct dentry *new_dentry)
 326 {
 327         return 0;
 328 }
 329
 330 static int dummy_inode_readlink (struct dentry *dentry)
 331 {
 332         return 0;
 333 }
 334
 335 static int dummy_inode_follow_link (struct dentry *dentry,
 336                                     struct nameidata *nameidata)
 337 {
 338         return 0;
 339 }
 340
 341 static int dummy_inode_permission (struct inode *inode, int mask, struct nameidata *nd)
 342 {
 343         return 0;
 344 }
 345
 346 static int dummy_inode_setattr (struct dentry *dentry, struct iattr *iattr)
 347 {
 348         return 0;
 349 }
 350
 351 static int dummy_inode_getattr (struct vfsmount *mnt, struct dentry *dentry)
 352 {
 353         return 0;
 354 }
 355
 356 static void dummy_inode_delete (struct inode *ino)
 357 {
 358         return;
 359 }
 360
 361 static int dummy_inode_setxattr (struct dentry *dentry, char *name, void *value,
 362                                 size_t size, int flags)
 363 {
 364         if (!strncmp(name, XATTR_SECURITY_PREFIX,
 365                      sizeof(XATTR_SECURITY_PREFIX) - 1) &&
 366             !capable(CAP_SYS_ADMIN))
 367                 return -EPERM;
 368         return 0;
 369 }
 370
 371 static void dummy_inode_post_setxattr (struct dentry *dentry, char *name, void *value,
 372                                        size_t size, int flags)
 373 {
 374 }
 375
 376 static int dummy_inode_getxattr (struct dentry *dentry, char *name)
 377 {
 378         return 0;
 379 }
 380
 381 static int dummy_inode_listxattr (struct dentry *dentry)
 382 {
 383         return 0;
 384 }
 385
 386 static int dummy_inode_removexattr (struct dentry *dentry, char *name)
 387 {
 388         if (!strncmp(name, XATTR_SECURITY_PREFIX,
 389                      sizeof(XATTR_SECURITY_PREFIX) - 1) &&
 390             !capable(CAP_SYS_ADMIN))
 391                 return -EPERM;
 392         return 0;
 393 }
 394
 395 static int dummy_inode_need_killpriv(struct dentry *dentry)
 396 {
 397         return 0;
 398 }
 399
 400 static int dummy_inode_killpriv(struct dentry *dentry)
 401 {
 402         return 0;
 403 }
 404
 405 static int dummy_inode_getsecurity(const struct inode *inode, const char *name, void *buffer, size_t size, int err)
 406 {
 407         return -EOPNOTSUPP;
 408 }
 409
 410 static int dummy_inode_setsecurity(struct inode *inode, const char *name, const void *value, size_t size, int flags)
 411 {
 412         return -EOPNOTSUPP;
 413 }
 414
 415 static int dummy_inode_listsecurity(struct inode *inode, char *buffer, size_t buffer_size)
 416 {
 417         return 0;
 418 }
 419
 420 static int dummy_file_permission (struct file *file, int mask)
 421 {
 422         return 0;
 423 }
 424
 425 static int dummy_file_alloc_security (struct file *file)
 426 {
 427         return 0;
 428 }
 429
 430 static void dummy_file_free_security (struct file *file)
 431 {
 432         return;
 433 }
 434
 435 static int dummy_file_ioctl (struct file *file, unsigned int command,
 436                              unsigned long arg)
 437 {
 438         return 0;
 439 }
 440
 441 static int dummy_file_mmap (struct file *file, unsigned long reqprot,
 442                             unsigned long prot,
 443                             unsigned long flags,
 444                             unsigned long addr,
 445                             unsigned long addr_only)
 446 {
 447         if ((addr < mmap_min_addr) && !capable(CAP_SYS_RAWIO))
 448                 return -EACCES;
 449         return 0;
 450 }
 451
 452 static int dummy_file_mprotect (struct vm_area_struct *vma,
 453                                 unsigned long reqprot,
 454                                 unsigned long prot)
 455 {
 456         return 0;
 457 }
 458
 459 static int dummy_file_lock (struct file *file, unsigned int cmd)
 460 {
 461         return 0;
 462 }
 463
 464 static int dummy_file_fcntl (struct file *file, unsigned int cmd,
 465                              unsigned long arg)
 466 {
 467         return 0;
 468 }
 469
 470 static int dummy_file_set_fowner (struct file *file)
 471 {
 472         return 0;
 473 }
 474
 475 static int dummy_file_send_sigiotask (struct task_struct *tsk,
 476                                       struct fown_struct *fown, int sig)
 477 {
 478         return 0;
 479 }
 480
 481 static int dummy_file_receive (struct file *file)
 482 {
 483         return 0;
 484 }
 485
 486 static int dummy_dentry_open (struct file *file)
 487 {
 488         return 0;
 489 }
 490
 491 static int dummy_task_create (unsigned long clone_flags)
 492 {
 493         return 0;
 494 }
 495
 496 static int dummy_task_alloc_security (struct task_struct *p)
 497 {
 498         return 0;
 499 }
 500
 501 static void dummy_task_free_security (struct task_struct *p)
 502 {
 503         return;
 504 }
 505
 506 static int dummy_task_setuid (uid_t id0, uid_t id1, uid_t id2, int flags)
 507 {
 508         return 0;
 509 }
 510
 511 static int dummy_task_post_setuid (uid_t id0, uid_t id1, uid_t id2, int flags)
 512 {
 513         dummy_capget(current, &current->cap_effective, &current->cap_inheritable, &current->cap_permitted);
 514         return 0;
 515 }
 516
 517 static int dummy_task_setgid (gid_t id0, gid_t id1, gid_t id2, int flags)
 518 {
 519         return 0;
 520 }
 521
 522 static int dummy_task_setpgid (struct task_struct *p, pid_t pgid)
 523 {
 524         return 0;
 525 }
 526
 527 static int dummy_task_getpgid (struct task_struct *p)
 528 {
 529         return 0;
 530 }
 531
 532 static int dummy_task_getsid (struct task_struct *p)
 533 {
 534         return 0;
 535 }
 536
 537 static void dummy_task_getsecid (struct task_struct *p, u32 *secid)
 538 { }
 539
 540 static int dummy_task_setgroups (struct group_info *group_info)
 541 {
 542         return 0;
 543 }
 544
 545 static int dummy_task_setnice (struct task_struct *p, int nice)
 546 {
 547         return 0;
 548 }
 549
 550 static int dummy_task_setioprio (struct task_struct *p, int ioprio)
 551 {
 552         return 0;
 553 }
 554
 555 static int dummy_task_getioprio (struct task_struct *p)
 556 {
 557         return 0;
 558 }
 559
 560 static int dummy_task_setrlimit (unsigned int resource, struct rlimit *new_rlim)
 561 {
 562         return 0;
 563 }
 564
 565 static int dummy_task_setscheduler (struct task_struct *p, int policy,
 566                                     struct sched_param *lp)
 567 {
 568         return 0;
 569 }
 570
 571 static int dummy_task_getscheduler (struct task_struct *p)
 572 {
 573         return 0;
 574 }
 575
 576 static int dummy_task_movememory (struct task_struct *p)
 577 {
 578         return 0;
 579 }
 580
 581 static int dummy_task_wait (struct task_struct *p)
 582 {
 583         return 0;
 584 }
 585
 586 static int dummy_task_kill (struct task_struct *p, struct siginfo *info,
 587                             int sig, u32 secid)
 588 {
 589         return 0;
 590 }
 591
 592 static int dummy_task_prctl (int option, unsigned long arg2, unsigned long arg3,
 593                              unsigned long arg4, unsigned long arg5)
 594 {
 595         return 0;
 596 }
 597
 598 static void dummy_task_reparent_to_init (struct task_struct *p)
 599 {
 600         p->euid = p->fsuid = 0;
 601         return;
 602 }
 603
 604 static void dummy_task_to_inode(struct task_struct *p, struct inode *inode)
 605 { }
 606
 607 static int dummy_ipc_permission (struct kern_ipc_perm *ipcp, short flag)
 608 {
 609         return 0;
 610 }
 611
 612 static int dummy_msg_msg_alloc_security (struct msg_msg *msg)
 613 {
 614         return 0;
 615 }
 616
 617 static void dummy_msg_msg_free_security (struct msg_msg *msg)
 618 {
 619         return;
 620 }
 621
 622 static int dummy_msg_queue_alloc_security (struct msg_queue *msq)
 623 {
 624         return 0;
 625 }
 626
 627 static void dummy_msg_queue_free_security (struct msg_queue *msq)
 628 {
 629         return;
 630 }
 631
 632 static int dummy_msg_queue_associate (struct msg_queue *msq,
 633                                       int msqflg)
 634 {
 635         return 0;
 636 }
 637
 638 static int dummy_msg_queue_msgctl (struct msg_queue *msq, int cmd)
 639 {
 640         return 0;
 641 }
 642
 643 static int dummy_msg_queue_msgsnd (struct msg_queue *msq, struct msg_msg *msg,
 644                                    int msgflg)
 645 {
 646         return 0;
 647 }
 648
 649 static int dummy_msg_queue_msgrcv (struct msg_queue *msq, struct msg_msg *msg,
 650                                    struct task_struct *target, long type,
 651                                    int mode)
 652 {
 653         return 0;
 654 }
 655
 656 static int dummy_shm_alloc_security (struct shmid_kernel *shp)
 657 {
 658         return 0;
 659 }
 660
 661 static void dummy_shm_free_security (struct shmid_kernel *shp)
 662 {
 663         return;
 664 }
 665
 666 static int dummy_shm_associate (struct shmid_kernel *shp, int shmflg)
 667 {
 668         return 0;
 669 }
 670
 671 static int dummy_shm_shmctl (struct shmid_kernel *shp, int cmd)
 672 {
 673         return 0;
 674 }
 675
 676 static int dummy_shm_shmat (struct shmid_kernel *shp, char __user *shmaddr,
 677                             int shmflg)
 678 {
 679         return 0;
 680 }
 681
 682 static int dummy_sem_alloc_security (struct sem_array *sma)
 683 {
 684         return 0;
 685 }
 686
 687 static void dummy_sem_free_security (struct sem_array *sma)
 688 {
 689         return;
 690 }
 691
 692 static int dummy_sem_associate (struct sem_array *sma, int semflg)
 693 {
 694         return 0;
 695 }
 696
 697 static int dummy_sem_semctl (struct sem_array *sma, int cmd)
 698 {
 699         return 0;
 700 }
 701
 702 static int dummy_sem_semop (struct sem_array *sma,
 703                             struct sembuf *sops, unsigned nsops, int alter)
 704 {
 705         return 0;
 706 }
 707
 708 static int dummy_netlink_send (struct sock *sk, struct sk_buff *skb)
 709 {
 710         NETLINK_CB(skb).eff_cap = current->cap_effective;
 711         return 0;
 712 }
 713
 714 static int dummy_netlink_recv (struct sk_buff *skb, int cap)
 715 {
 716         if (!cap_raised (NETLINK_CB (skb).eff_cap, cap))
 717                 return -EPERM;
 718         return 0;
 719 }
 720
 721 #ifdef CONFIG_SECURITY_NETWORK
 722 static int dummy_unix_stream_connect (struct socket *sock,
 723                                       struct socket *other,
 724                                       struct sock *newsk)
 725 {
 726         return 0;
 727 }
 728
 729 static int dummy_unix_may_send (struct socket *sock,
 730                                 struct socket *other)
 731 {
 732         return 0;
 733 }
 734
 735 static int dummy_socket_create (int family, int type,
 736                                 int protocol, int kern)
 737 {
 738         return 0;
 739 }
 740
 741 static int dummy_socket_post_create (struct socket *sock, int family, int type,
 742                                      int protocol, int kern)
 743 {
 744         return 0;
 745 }
 746
 747 static int dummy_socket_bind (struct socket *sock, struct sockaddr *address,
 748                               int addrlen)
 749 {
 750         return 0;
 751 }
 752
 753 static int dummy_socket_connect (struct socket *sock, struct sockaddr *address,
 754                                  int addrlen)
 755 {
 756         return 0;
 757 }
 758
 759 static int dummy_socket_listen (struct socket *sock, int backlog)
 760 {
 761         return 0;
 762 }
 763
 764 static int dummy_socket_accept (struct socket *sock, struct socket *newsock)
 765 {
 766         return 0;
 767 }
 768
 769 static void dummy_socket_post_accept (struct socket *sock,
 770                                       struct socket *newsock)
 771 {
 772         return;
 773 }
 774
 775 static int dummy_socket_sendmsg (struct socket *sock, struct msghdr *msg,
 776                                  int size)
 777 {
 778         return 0;
 779 }
 780
 781 static int dummy_socket_recvmsg (struct socket *sock, struct msghdr *msg,
 782                                  int size, int flags)
 783 {
 784         return 0;
 785 }
 786
 787 static int dummy_socket_getsockname (struct socket *sock)
 788 {
 789         return 0;
 790 }
 791
 792 static int dummy_socket_getpeername (struct socket *sock)
 793 {
 794         return 0;
 795 }
 796
 797 static int dummy_socket_setsockopt (struct socket *sock, int level, int optname)
 798 {
 799         return 0;
 800 }
 801
 802 static int dummy_socket_getsockopt (struct socket *sock, int level, int optname)
 803 {
 804         return 0;
 805 }
 806
 807 static int dummy_socket_shutdown (struct socket *sock, int how)
 808 {
 809         return 0;
 810 }
 811
 812 static int dummy_socket_sock_rcv_skb (struct sock *sk, struct sk_buff *skb)
 813 {
 814         return 0;
 815 }
 816
 817 static int dummy_socket_getpeersec_stream(struct socket *sock, char __user *optval,
 818                                           int __user *optlen, unsigned len)
 819 {
 820         return -ENOPROTOOPT;
 821 }
 822
 823 static int dummy_socket_getpeersec_dgram(struct socket *sock, struct sk_buff *skb, u32 *secid)
 824 {
 825         return -ENOPROTOOPT;
 826 }
 827
 828 static inline int dummy_sk_alloc_security (struct sock *sk, int family, gfp_t priority)
 829 {
 830         return 0;
 831 }
 832
 833 static inline void dummy_sk_free_security (struct sock *sk)
 834 {
 835 }
 836
 837 static inline void dummy_sk_clone_security (const struct sock *sk, struct sock *newsk)
 838 {
 839 }
 840
 841 static inline void dummy_sk_getsecid(struct sock *sk, u32 *secid)
 842 {
 843 }
 844
 845 static inline void dummy_sock_graft(struct sock* sk, struct socket *parent)
 846 {
 847 }
 848
 849 static inline int dummy_inet_conn_request(struct sock *sk,
 850                         struct sk_buff *skb, struct request_sock *req)
 851 {
 852         return 0;
 853 }
 854
 855 static inline void dummy_inet_csk_clone(struct sock *newsk,
 856                         const struct request_sock *req)
 857 {
 858 }
 859
 860 static inline void dummy_inet_conn_established(struct sock *sk,
 861                         struct sk_buff *skb)
 862 {
 863 }
 864
 865 static inline void dummy_req_classify_flow(const struct request_sock *req,
 866                         struct flowi *fl)
 867 {
 868 }
 869 #endif  /* CONFIG_SECURITY_NETWORK */
 870
 871 #ifdef CONFIG_SECURITY_NETWORK_XFRM
 872 static int dummy_xfrm_policy_alloc_security(struct xfrm_policy *xp,
 873                 struct xfrm_user_sec_ctx *sec_ctx)
 874 {
 875         return 0;
 876 }
 877
 878 static inline int dummy_xfrm_policy_clone_security(struct xfrm_policy *old, struct xfrm_policy *new)
 879 {
 880         return 0;
 881 }
 882
 883 static void dummy_xfrm_policy_free_security(struct xfrm_policy *xp)
 884 {
 885 }
 886
 887 static int dummy_xfrm_policy_delete_security(struct xfrm_policy *xp)
 888 {
 889         return 0;
 890 }
 891
 892 static int dummy_xfrm_state_alloc_security(struct xfrm_state *x,
 893         struct xfrm_user_sec_ctx *sec_ctx, u32 secid)
 894 {
 895         return 0;
 896 }
 897
 898 static void dummy_xfrm_state_free_security(struct xfrm_state *x)
 899 {
 900 }
 901
 902 static int dummy_xfrm_state_delete_security(struct xfrm_state *x)
 903 {
 904         return 0;
 905 }
 906
 907 static int dummy_xfrm_policy_lookup(struct xfrm_policy *xp, u32 sk_sid, u8 dir)
 908 {
 909         return 0;
 910 }
 911
 912 static int dummy_xfrm_state_pol_flow_match(struct xfrm_state *x,
 913                                 struct xfrm_policy *xp, struct flowi *fl)
 914 {
 915         return 1;
 916 }
 917
 918 static int dummy_xfrm_decode_session(struct sk_buff *skb, u32 *fl, int ckall)
 919 {
 920         return 0;
 921 }
 922
 923 #endif /* CONFIG_SECURITY_NETWORK_XFRM */
 924 static int dummy_register_security (const char *name, struct security_operations *ops)
 925 {
 926         return -EINVAL;
 927 }
 928
 929 static void dummy_d_instantiate (struct dentry *dentry, struct inode *inode)
 930 {
 931         return;
 932 }
 933
 934 static int dummy_getprocattr(struct task_struct *p, char *name, char **value)
 935 {
 936         return -EINVAL;
 937 }
 938
 939 static int dummy_setprocattr(struct task_struct *p, char *name, void *value, size_t size)
 940 {
 941         return -EINVAL;
 942 }
 943
 944 static int dummy_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
 945 {
 946         return -EOPNOTSUPP;
 947 }
 948
 949 static int dummy_secctx_to_secid(char *secdata, u32 seclen, u32 *secid)
 950 {
 951         return -EOPNOTSUPP;
 952 }
 953
 954 static void dummy_release_secctx(char *secdata, u32 seclen)
 955 {
 956 }
 957
 958 #ifdef CONFIG_KEYS
 959 static inline int dummy_key_alloc(struct key *key, struct task_struct *ctx,
 960                                   unsigned long flags)
 961 {
 962         return 0;
 963 }
 964
 965 static inline void dummy_key_free(struct key *key)
 966 {
 967 }
 968
 969 static inline int dummy_key_permission(key_ref_t key_ref,
 970                                        struct task_struct *context,
 971                                        key_perm_t perm)
 972 {
 973         return 0;
 974 }
 975 #endif /* CONFIG_KEYS */
 976
 977 struct security_operations dummy_security_ops;
 978
 979 #define set_to_dummy_if_null(ops, function)                             \
 980         do {                                                            \
 981                 if (!ops->function) {                                   \
 982                         ops->function = dummy_##function;               \
 983                         pr_debug("Had to override the " #function       \
 984                                  " security operation with the dummy one.\n");\
 985                         }                                               \
 986         } while (0)
 987
 988 void security_fixup_ops (struct security_operations *ops)
 989 {
 990         set_to_dummy_if_null(ops, ptrace);
 991         set_to_dummy_if_null(ops, capget);
 992         set_to_dummy_if_null(ops, capset_check);
 993         set_to_dummy_if_null(ops, capset_set);
 994         set_to_dummy_if_null(ops, acct);
 995         set_to_dummy_if_null(ops, capable);
 996         set_to_dummy_if_null(ops, quotactl);
 997         set_to_dummy_if_null(ops, quota_on);
 998         set_to_dummy_if_null(ops, sysctl);
 999         set_to_dummy_if_null(ops, syslog);
1000         set_to_dummy_if_null(ops, settime);
1001         set_to_dummy_if_null(ops, vm_enough_memory);
1002         set_to_dummy_if_null(ops, bprm_alloc_security);
1003         set_to_dummy_if_null(ops, bprm_free_security);
1004         set_to_dummy_if_null(ops, bprm_apply_creds);
1005         set_to_dummy_if_null(ops, bprm_post_apply_creds);
1006         set_to_dummy_if_null(ops, bprm_set_security);
1007         set_to_dummy_if_null(ops, bprm_check_security);
1008         set_to_dummy_if_null(ops, bprm_secureexec);
1009         set_to_dummy_if_null(ops, sb_alloc_security);
1010         set_to_dummy_if_null(ops, sb_free_security);
1011         set_to_dummy_if_null(ops, sb_copy_data);
1012         set_to_dummy_if_null(ops, sb_kern_mount);
1013         set_to_dummy_if_null(ops, sb_statfs);
1014         set_to_dummy_if_null(ops, sb_mount);
1015         set_to_dummy_if_null(ops, sb_check_sb);
1016         set_to_dummy_if_null(ops, sb_umount);
1017         set_to_dummy_if_null(ops, sb_umount_close);
1018         set_to_dummy_if_null(ops, sb_umount_busy);
1019         set_to_dummy_if_null(ops, sb_post_remount);
1020         set_to_dummy_if_null(ops, sb_post_addmount);
1021         set_to_dummy_if_null(ops, sb_pivotroot);
1022         set_to_dummy_if_null(ops, sb_post_pivotroot);
1023         set_to_dummy_if_null(ops, sb_get_mnt_opts);
1024         set_to_dummy_if_null(ops, sb_set_mnt_opts);
1025         set_to_dummy_if_null(ops, sb_clone_mnt_opts);
1026         set_to_dummy_if_null(ops, inode_alloc_security);
1027         set_to_dummy_if_null(ops, inode_free_security);
1028         set_to_dummy_if_null(ops, inode_init_security);
1029         set_to_dummy_if_null(ops, inode_create);
1030         set_to_dummy_if_null(ops, inode_link);
1031         set_to_dummy_if_null(ops, inode_unlink);
1032         set_to_dummy_if_null(ops, inode_symlink);
1033         set_to_dummy_if_null(ops, inode_mkdir);
1034         set_to_dummy_if_null(ops, inode_rmdir);
1035         set_to_dummy_if_null(ops, inode_mknod);
1036         set_to_dummy_if_null(ops, inode_rename);
1037         set_to_dummy_if_null(ops, inode_readlink);
1038         set_to_dummy_if_null(ops, inode_follow_link);
1039         set_to_dummy_if_null(ops, inode_permission);
1040         set_to_dummy_if_null(ops, inode_setattr);
1041         set_to_dummy_if_null(ops, inode_getattr);
1042         set_to_dummy_if_null(ops, inode_delete);
1043         set_to_dummy_if_null(ops, inode_setxattr);
1044         set_to_dummy_if_null(ops, inode_post_setxattr);
1045         set_to_dummy_if_null(ops, inode_getxattr);
1046         set_to_dummy_if_null(ops, inode_listxattr);
1047         set_to_dummy_if_null(ops, inode_removexattr);
1048         set_to_dummy_if_null(ops, inode_need_killpriv);
1049         set_to_dummy_if_null(ops, inode_killpriv);
1050         set_to_dummy_if_null(ops, inode_getsecurity);
1051         set_to_dummy_if_null(ops, inode_setsecurity);
1052         set_to_dummy_if_null(ops, inode_listsecurity);
1053         set_to_dummy_if_null(ops, file_permission);
1054         set_to_dummy_if_null(ops, file_alloc_security);
1055         set_to_dummy_if_null(ops, file_free_security);
1056         set_to_dummy_if_null(ops, file_ioctl);
1057         set_to_dummy_if_null(ops, file_mmap);
1058         set_to_dummy_if_null(ops, file_mprotect);
1059         set_to_dummy_if_null(ops, file_lock);
1060         set_to_dummy_if_null(ops, file_fcntl);
1061         set_to_dummy_if_null(ops, file_set_fowner);
1062         set_to_dummy_if_null(ops, file_send_sigiotask);
1063         set_to_dummy_if_null(ops, file_receive);
1064         set_to_dummy_if_null(ops, dentry_open);
1065         set_to_dummy_if_null(ops, task_create);
1066         set_to_dummy_if_null(ops, task_alloc_security);
1067         set_to_dummy_if_null(ops, task_free_security);
1068         set_to_dummy_if_null(ops, task_setuid);
1069         set_to_dummy_if_null(ops, task_post_setuid);
1070         set_to_dummy_if_null(ops, task_setgid);
1071         set_to_dummy_if_null(ops, task_setpgid);
1072         set_to_dummy_if_null(ops, task_getpgid);
1073         set_to_dummy_if_null(ops, task_getsid);
1074         set_to_dummy_if_null(ops, task_getsecid);
1075         set_to_dummy_if_null(ops, task_setgroups);
1076         set_to_dummy_if_null(ops, task_setnice);
1077         set_to_dummy_if_null(ops, task_setioprio);
1078         set_to_dummy_if_null(ops, task_getioprio);
1079         set_to_dummy_if_null(ops, task_setrlimit);
1080         set_to_dummy_if_null(ops, task_setscheduler);
1081         set_to_dummy_if_null(ops, task_getscheduler);
1082         set_to_dummy_if_null(ops, task_movememory);
1083         set_to_dummy_if_null(ops, task_wait);
1084         set_to_dummy_if_null(ops, task_kill);
1085         set_to_dummy_if_null(ops, task_prctl);
1086         set_to_dummy_if_null(ops, task_reparent_to_init);
1087         set_to_dummy_if_null(ops, task_to_inode);
1088         set_to_dummy_if_null(ops, ipc_permission);
1089         set_to_dummy_if_null(ops, msg_msg_alloc_security);
1090         set_to_dummy_if_null(ops, msg_msg_free_security);
1091         set_to_dummy_if_null(ops, msg_queue_alloc_security);
1092         set_to_dummy_if_null(ops, msg_queue_free_security);
1093         set_to_dummy_if_null(ops, msg_queue_associate);
1094         set_to_dummy_if_null(ops, msg_queue_msgctl);
1095         set_to_dummy_if_null(ops, msg_queue_msgsnd);
1096         set_to_dummy_if_null(ops, msg_queue_msgrcv);
1097         set_to_dummy_if_null(ops, shm_alloc_security);
1098         set_to_dummy_if_null(ops, shm_free_security);
1099         set_to_dummy_if_null(ops, shm_associate);
1100         set_to_dummy_if_null(ops, shm_shmctl);
1101         set_to_dummy_if_null(ops, shm_shmat);
1102         set_to_dummy_if_null(ops, sem_alloc_security);
1103         set_to_dummy_if_null(ops, sem_free_security);
1104         set_to_dummy_if_null(ops, sem_associate);
1105         set_to_dummy_if_null(ops, sem_semctl);
1106         set_to_dummy_if_null(ops, sem_semop);
1107         set_to_dummy_if_null(ops, netlink_send);
1108         set_to_dummy_if_null(ops, netlink_recv);
1109         set_to_dummy_if_null(ops, register_security);
1110         set_to_dummy_if_null(ops, d_instantiate);
1111         set_to_dummy_if_null(ops, getprocattr);
1112         set_to_dummy_if_null(ops, setprocattr);
1113         set_to_dummy_if_null(ops, secid_to_secctx);
1114         set_to_dummy_if_null(ops, secctx_to_secid);
1115         set_to_dummy_if_null(ops, release_secctx);
1116 #ifdef CONFIG_SECURITY_NETWORK
1117         set_to_dummy_if_null(ops, unix_stream_connect);
1118         set_to_dummy_if_null(ops, unix_may_send);
1119         set_to_dummy_if_null(ops, socket_create);
1120         set_to_dummy_if_null(ops, socket_post_create);
1121         set_to_dummy_if_null(ops, socket_bind);
1122         set_to_dummy_if_null(ops, socket_connect);
1123         set_to_dummy_if_null(ops, socket_listen);
1124         set_to_dummy_if_null(ops, socket_accept);
1125         set_to_dummy_if_null(ops, socket_post_accept);
1126         set_to_dummy_if_null(ops, socket_sendmsg);
1127         set_to_dummy_if_null(ops, socket_recvmsg);
1128         set_to_dummy_if_null(ops, socket_getsockname);
1129         set_to_dummy_if_null(ops, socket_getpeername);
1130         set_to_dummy_if_null(ops, socket_setsockopt);
1131         set_to_dummy_if_null(ops, socket_getsockopt);
1132         set_to_dummy_if_null(ops, socket_shutdown);
1133         set_to_dummy_if_null(ops, socket_sock_rcv_skb);
1134         set_to_dummy_if_null(ops, socket_getpeersec_stream);
1135         set_to_dummy_if_null(ops, socket_getpeersec_dgram);
1136         set_to_dummy_if_null(ops, sk_alloc_security);
1137         set_to_dummy_if_null(ops, sk_free_security);
1138         set_to_dummy_if_null(ops, sk_clone_security);
1139         set_to_dummy_if_null(ops, sk_getsecid);
1140         set_to_dummy_if_null(ops, sock_graft);
1141         set_to_dummy_if_null(ops, inet_conn_request);
1142         set_to_dummy_if_null(ops, inet_csk_clone);
1143         set_to_dummy_if_null(ops, inet_conn_established);
1144         set_to_dummy_if_null(ops, req_classify_flow);
1145  #endif /* CONFIG_SECURITY_NETWORK */
1146 #ifdef  CONFIG_SECURITY_NETWORK_XFRM
1147         set_to_dummy_if_null(ops, xfrm_policy_alloc_security);
1148         set_to_dummy_if_null(ops, xfrm_policy_clone_security);
1149         set_to_dummy_if_null(ops, xfrm_policy_free_security);
1150         set_to_dummy_if_null(ops, xfrm_policy_delete_security);
1151         set_to_dummy_if_null(ops, xfrm_state_alloc_security);
1152         set_to_dummy_if_null(ops, xfrm_state_free_security);
1153         set_to_dummy_if_null(ops, xfrm_state_delete_security);
1154         set_to_dummy_if_null(ops, xfrm_policy_lookup);
1155         set_to_dummy_if_null(ops, xfrm_state_pol_flow_match);
1156         set_to_dummy_if_null(ops, xfrm_decode_session);
1157 #endif  /* CONFIG_SECURITY_NETWORK_XFRM */
1158 #ifdef CONFIG_KEYS
1159         set_to_dummy_if_null(ops, key_alloc);
1160         set_to_dummy_if_null(ops, key_free);
1161         set_to_dummy_if_null(ops, key_permission);
1162 #endif  /* CONFIG_KEYS */
1163
1164 }
1165